What Symptoms Indicate the Need to Replace Spark Plugs?

[FelixLee]

If your car experiences difficulty starting, reduced power, excessive exhaust emissions, or increased fuel consumption, it may be time to replace the spark plugs, as these are common symptoms of faulty spark plugs. Effects of Worn-Out Spark Plugs: Damaged spark plugs can lead to various issues, such as electrical leakage in the ignition system, higher fuel consumption, and decreased engine performance. The most critical problem is difficulty starting the engine, which can disrupt normal vehicle operation. Severe spark plug erosion—evident by pitting, electrode damage, or melting—indicates that the spark plugs are worn out and should be replaced. Steps to Replace Spark Plugs: Open the engine hood and remove the plastic cover of the engine. Disconnect the high-voltage wires, marking each cylinder's position to avoid confusion. Use a spark plug socket to remove each spark plug one by one. While removing them, check for external debris like leaves or dust and ensure the area is thoroughly cleaned. Insert the new spark plugs into the spark plug holes, hand-tightening them first before using the socket wrench to secure them. Reinstall the high-voltage wires in the correct firing order, then reattach the cover.